title: Layer-by-layer evolution of a two-dimensional electron gas near an oxide interface.
abstract: We report the momentum-resolved measurement of a two-dimensional electron gas at the LaTiO(3)/SrTiO(3) interface by angle-resolved photoemission spectroscopy (ARPES). Thanks to an advanced sample preparation technique, the orbital character of the conduction electrons and the electronic correlations can be accessed quantitatively as each unit cell layer is added. We find that all of these quantities change dramatically with distance from the interface. These findings open the way to analogous studies on other heterostructures, which are traditionally a forbidden field for ARPES.
authors.affiliation: Advanced Light Source (ALS), E. O. Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA and Department of Physical Chemistry, Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany and Department of Physics, University of Seoul, Seoul 130-743, Korea.
authors.forename: Young Jun
authors.initials: YJ
authors.lastname: Chang
authors.forename: Luca
authors.initials: L
authors.lastname: Moreschini
authors.forename: Aaron
authors.initials: A
authors.lastname: Bostwick
authors.forename: Geoffrey A
authors.initials: GA
authors.lastname: Gaines
authors.forename: Yong Su
authors.initials: YS
authors.lastname: Kim
authors.forename: Andrew L
authors.initials: AL
authors.lastname: Walter
authors.forename: Byron
authors.initials: B
authors.lastname: Freelon
authors.forename: Antonello
authors.initials: A
authors.lastname: Tebano
authors.forename: Karsten
authors.initials: K
authors.lastname: Horn
authors.forename: Eli
authors.initials: E
authors.lastname: Rotenberg